From:   Frank Li <frank.li@nxp.com>
To:     Shunsuke Mie <mie@igel.co.jp>
CC:     "Michael S. Tsirkin" <mst@redhat.com>,
        Lorenzo Pieralisi <lpieralisi@kernel.org>,
        =?iso-8859-2?Q?Krzysztof_Wilczy=F1ski?= <kw@linux.com>,
        Manivannan Sadhasivam <mani@kernel.org>,
        Kishon Vijay Abraham I <kishon@kernel.org>,
        Bjorn Helgaas <bhelgaas@google.com>,
        Jason Wang <jasowang@redhat.com>, Jon Mason <jdmason@kudzu.us>,
        Ren Zhijie <renzhijie2@huawei.com>,
        Takanari Hayama <taki@igel.co.jp>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
        "virtualization@lists.linux-foundation.org" 
        <virtualization@lists.linux-foundation.org>
Subject: RE: [EXT] Re: [RFC PATCH 4/4] PCI: endpoint: function: Add EP
 function driver to provide virtio net device
Thread-Topic: [EXT] Re: [RFC PATCH 4/4] PCI: endpoint: function: Add EP
 function driver to provide virtio net device
Thread-Index: AQHZN7liQTou1LlKIkegIEQy1N8nRq69xHgwgAWRngCAAEuvAA==
Date:   Tue, 7 Feb 2023 15:37:16 +0000
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> > but it may need update host side pci virtio driver.
> Thanks, is it possible to use  MSI-X as well? The virtio spec
> indicates to use legacy irq or
> MSI-X only.

I supposed yes. It is depend MSI controller type in EP side.=20
But not like standard PCI MSI-X, it is platform MSI-X irq.=20

If use GIC-its, it should support MSI-X.

Thomas Gleixner is working on pre-device msi irq domain.=20
https://lore.kernel.org/all/20221121135653.208611233@linutronix.de

I hope Thomas can finish their work soon.=20
so I can continue my patch upstream work.
https://lore.kernel.org/imx/87wn7evql7.ffs@tglx/T/#u

> >
> Best,
> Shunsuke.